Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: How to multiply two ints and check
Message-ID: <10291@smoke.BRL.MIL>
Date: 19 May 89 18:30:53 GMT
References: <434@skye.ed.ac.uk> <4700038@m.cs.uiuc.edu>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 7

In article <4700038@m.cs.uiuc.edu> robison@m.cs.uiuc.edu writes:
>There is a much simpler, faster, and machine-independent way to check
>for multiplication overflow --- check the product by division.  ...

Nope, for portability you have to avoid signed-integer overflow in
the first place.  The overflow might (and does in some implementations)
cause an ABEND.